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System ElasticSearch Microsoft SQLServer
 Name ElasticSearch Microsoft SQL Server
 Version Version 6.4.1 (released in September 2018) Sqlserver 2017
 Drawbacks Elasticsearch AMI not available high license costs. Applicable for transaction systems in large enterprises
 Advantages Large number of drivers present for integration ACID compliant. Easy to use User Interface
 Languages Supported .Net Groovy Java JavaScript Perl PHP Python Ruby C# C++ Delphi Go Java JavaScript (Node.js) PHP Python R (Microsoft R) Ruby Visual Basic
 Website www.elastic.co/­products/­elasticsearch www.microsoft.com/en-us/sql-server
 XML Support no yes
 JSON Support yes yes
 Brief description Elasticsearch is a search engine based on Lucene. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. As a database server, it is a software product with the primary function of storing and retrieving data as requested by other software applications—which may run either on the same computer or on another computer across a network (including the Internet).
 Database Model Key Value NoSQL Model Primarily a relational database
 Technical Documentation www.elastic.co/­guide/­en/­elasticsearch/­reference/­current/­index.html docs.microsoft.com/­en-ie/­sql/­sql-server/­sql-server-technical-documentation
 License Open Source. Commercial version with HA available with redislabs.com Commercial
 Cloud-based / SaaS ElasticSearch Cloud Cluster available from ElasticSearch Available in AWS, Azure Clouds. Available as a SaaS option in Microsoft Cloud
 Implementation Language C,C++ C,C++
 Operating System Supported Linux OS X Solaris Windows Linux Windows
 Options for Integration / Access API Proprietary protocol using JSON OLE DB, Tabular Data Stream (TDS), ADO.NET, JDBC, ODBC
 Consistency Highly Consistent Highly Consistent
 Foreign Keys No Yes
 Streaming Support Yes No
 Analytics Support NA Need to buy SQLServer Analytics Pack (SSAS)
 Data Storage Schema Inverted Index Relational Database
 Notable Users -- Most of the Fortune 500 Companies
 Key Differentiator No known Enterprise Competitor apart from Amazaon Cloud Search Highly reliable as a transactional database
 Concurrency Yes Yes
 Partitioning Yes No
 Replication Yes Yes
 Secondary Indexes Yes Yes
 SchemaLess Yes No
 SQL Query No Yes